6 Toggles your 'simopen' variable 0/1. Equivalent to "set simopen". If
7 simopen is 1, then you are open to play more than one chess game at a time:
8 have a simultaneous chess exhibition. More details are in the "simuls" help
11 See Also: simuls variables
13 [Last modified: June 22, 1995 -- Friar]